package com.nannybear.Model;

import android.os.Handler;

import com.jjoe64.graphview.series.DataPoint;

import java.util.ArrayList;
import java.util.Observer;

/**
 * \brief Manage the humidity and temperature graphic
 * \author Benjamin LANCINOT
 * \date 19-03-2015
 */
/********************************* COPYRIGHT *********************************
 * Copyright (c) 2015, Audrey LOISEAU and Benjamin LANCINOT.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *************************************************************************************/

public class Graphic extends Constant{

    /********** DECLARATIONS **********/
    //Variables
    private Long lastTime;
    private ArrayList<DataPoint> arrayListData;
    private ArrayList<Observer> observers;
    private boolean isMyFirstData;
    private boolean isSchedule;

    // Handler
    private final Handler myTimer = new Handler();


    /************ METHODS ************/
    /**
     * \brief Constructor
     */
	public Graphic() {
        this.observers = new ArrayList<>();
        initData();
	}

    /**
     * \brief Add the class as observable
     * \param obs   The new observer
     */
    public void addObserver(Observer obs){
        observers.add(obs);
    }

    /**
     * \brief Delete the class as observable
     * \param obs   The observer to delete
     */
    public synchronized void deleteObserver(Observer obs){
        observers.remove(obs);
    }

    /**
     * \brief Notify the observers
     */
    public void notifyObservers(){
        for (int i = 0; i < observers.size(); i++) {
            observers.get(i).update(this, this.arrayListData);
        }
    }

    /**
     * \brief Initialization of the graph with the value (0;0)
     */
    private void initData(){
        arrayListData = new ArrayList<>();
        arrayListData.add(new DataPoint(0, 0));
        isMyFirstData = true;
    }

    /**
     * \brief Reset all data of array list
     */
    public void resetData(){
        double data;
        myTimer.removeCallbacksAndMessages(null);
        data = arrayListData.get(arrayListData.size()-1).getY();
        isSchedule = false;
        lastTime = System.currentTimeMillis();
        arrayListData = new ArrayList<>();
        arrayListData.add(new DataPoint(0,data));
        notifyObservers();
        ScheduleDisplayWithinTwoSeconds();
    }

    /**
     * \brief Reception of a new value
     * \param value     The new value
     */
    public void update(double value){
        int cast = (int)(value*10);
        value = cast /10.0;
        if(isMyFirstData) {
            lastTime = System.currentTimeMillis();
            arrayListData.set(0, new DataPoint(0, value));
            notifyObservers();
            ScheduleDisplayWithinTwoSeconds();
            isMyFirstData=false;
        }
        else {
            calculateDataToDisplay(true,value);
        }
    }

    /**
     * \brief Calculate new data to display on the graphic
     */
    private void calculateDataToDisplay(boolean isData, double Data){
        int intTime;
        long interval;
        double time;

        //Calculate time interval in second with the last refreshment of the graphic
        interval = (System.currentTimeMillis() - lastTime)/1000;
        intTime = Long.valueOf(interval).intValue();
        lastTime = System.currentTimeMillis();

        time = intTime;

        //Add a data if new value are received or just after it
        if (isData) {
            myTimer.removeCallbacksAndMessages(null);
            arrayListData.add(new DataPoint(0, Data));

            isSchedule= false;
        }
        else{
            if(!isSchedule) {
                arrayListData.add(new DataPoint(0, Data));
                isSchedule=true;
            }
        }
        for (int i=0;i<arrayListData.size()-1;i++){
            arrayListData.set(i, new DataPoint(arrayListData.get(i).getX()-time, arrayListData.get(i).getY()));
        }

        //Redraw the graphic
        notifyObservers();
        ScheduleDisplayWithinTwoSeconds();
    }

    /**
     * \brief Timer to draw every 2sec
     */
    private void ScheduleDisplayWithinTwoSeconds() {
        //Runnable for display periodically the time on the graph if new Data is not received
        final Runnable runGraph = new Runnable() {
            @Override
            public void run() {
                calculateDataToDisplay(false, arrayListData.get(arrayListData.size() - 1).getY());
            }
        };
        myTimer.postDelayed(runGraph, 2000);
    }


    /*********** ACCESSORS ***********/
    /**
     * \brief Get method for all the data in the array list
     */
    public ArrayList<DataPoint> getArrayListData() {
        return arrayListData;
    }
}
